21939545749360 has 40 divisors (see below), whose sum is σ = 51040228390416. Its totient is φ = 8770522037760.

The previous prime is 21939545749259. The next prime is 21939545749379. The reversal of 21939545749360 is 6394754593912.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82620706 + ... + 82885825.

Almost surely, 2^{21939545749360} is an apocalyptic number.

21939545749360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21939545749360 is an abundant number, since it is smaller than the sum of its proper divisors (29100682641056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21939545749360 is a wasteful number, since it uses less digits than its factorization.

21939545749360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165508201 (or 165508195 counting only the distinct ones).

The product of its (nonzero) digits is 220449600, while the sum is 67.

The spelling of 21939545749360 in words is "twenty-one trillion, nine hundred thirty-nine billion, five hundred forty-five million, seven hundred forty-nine thousand, three hundred sixty".